Avalanche908 Posted August 15, 2013 Share Posted August 15, 2013 I have a 1990 RD690S, fuel gauge not working- what voltage should be at sender? Quote Link to comment https://www.bigmacktrucks.com/topic/32336-fuel-gauge/ Share on other sites More sharing options...
39 Baby Mack Posted August 17, 2013 Share Posted August 17, 2013 If this a normal old fashioned fuel gauge and they haven't f----d them up yet?They work to ground.They're should be two wires on the sending unit, one under one of the screws holding the unit in the tank which would be a ground, the other in the center of the sending goes to the gauge.If you put a jumper between the two, with the key on,the gauge should go all the way to full.If it does then it is more than likely that your sending unit is bad.If it doesn't then the problem is more than likely in the wiring.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/32336-fuel-gauge/#findComment-200104 Share on other sites More sharing options...
masterwelder Posted August 17, 2013 Share Posted August 17, 2013 A 3ft stick will work also, just don't try it at 55! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/32336-fuel-gauge/#findComment-200106 Share on other sites More sharing options...
39 Baby Mack Posted August 17, 2013 Share Posted August 17, 2013 A 3ft stick will work also, just don't try it at 55!Yea I know what you meanThe fuel gauges didn't work in most of our trucks. We would try to keep them working but after awhile just gave up on them.The drivers were experienced enough, they use to write down the mileage when they fueled up and would keep track of the mileage.This worked just as well, they knew when they needed to fuel.We had one driver who everybody else kind of kidded because he wouldn't run as far as everybody else did between fueling.I can still hear him, when they would kid him about it, replying in a deep voice "it's too big to push" !!!Ron 1 Quote Link to comment https://www.bigmacktrucks.com/topic/32336-fuel-gauge/#findComment-200109 Share on other sites More sharing options...
pmolitor Posted August 24, 2013 Share Posted August 24, 2013 I got a different style from orreily auto parts a month ago. it was a cylinder with an internal float. just order for 24in or 26in tank and drop it in. no setting floats. works gerat so far. Quote Link to comment https://www.bigmacktrucks.com/topic/32336-fuel-gauge/#findComment-201510 Share on other sites More sharing options...
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